IGF1 is aprotein that in humans is encoded by the IGF1 gene. IGF1 has also beenreferred to as a sulfation factor and its effects were termed nonsuppressibleinsulin-like activity (NSILA) in the 1970s. IGF1 is a hormone similar inmolecular structure to insulin. It plays an important role in childhoodgrowth and continues to have anabolic effects in adults. A synthetic analogof IGF1, mecasermin is used for the treatment of growth failure.

Bioactivity isassayed by measuring the dose dependent effect of human IGF1 on proliferationof FDC-P1 cells, mouse progenitor cells of granulocytes, monocytes andmacrophages. The ED50 for this effect is 10.0 ng/ml.

Specific Activity:

1 x 105U/mg

Reconstitution:

Centrifuge vialprior to opening. Add steriledistilled water to the vial to fully solubilize the protein to aconcentration not less than 100 ng/ml.

Storage:

Store lyophilizedprotein at -20°C and reconstituted protein in working aliquots at -20°C witha carrier protein (0.1% HSA or BSA) as a stabilizer for long term storage. Pleasenote that the addition of any carrier protein into this product may produceunwanted endotoxin. This depends upon the particular application employed. Avoidrepeated freeze-thaw cycles.